soc: st: stm32: add stm32c09x support

Adds SoC support for the STM32C091, and the STM32C092 SoCs
which are part of the STM32C0 series.

Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>

soc/st/stm32/soc.yml

@@ -6,6 +6,8 @@ family:
     - name: stm32c011xx
     - name: stm32c031xx
     - name: stm32c071xx
+    - name: stm32c091xx
+    - name: stm32c092xx
   - name: stm32f0x
     socs:
     - name: stm32f030x6

soc/st/stm32/stm32c0x/Kconfig.defconfig.stm32c091xx

@@ -0,0 +1,12 @@
+# STMicroelectronics STM32C091xx MCU
+
+# Copyright (c) 2024 STMicroelectronics
+# Copyright (c) 2025 Thomas Stranger
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32C091XX
+
+config NUM_IRQS
+	default 30
+
+endif # SOC_STM32C091XX

soc/st/stm32/stm32c0x/Kconfig.defconfig.stm32c092xx

@@ -0,0 +1,12 @@
+# STMicroelectronics STM32C092xx MCU
+
+# Copyright (c) 2024 STMicroelectronics
+# Copyright (c) 2025 Thomas Stranger
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32C092XX
+
+config NUM_IRQS
+	default 32
+
+endif # SOC_STM32C092XX

soc/st/stm32/stm32c0x/Kconfig.soc

@@ -22,7 +22,17 @@ config SOC_STM32C071XX
 	bool
 	select SOC_SERIES_STM32C0X
 
+config SOC_STM32C091XX
+	bool
+	select SOC_SERIES_STM32C0X
+
+config SOC_STM32C092XX
+	bool
+	select SOC_SERIES_STM32C0X
+
 config SOC
 	default "stm32c011xx" if SOC_STM32C011XX
 	default "stm32c031xx" if SOC_STM32C031XX
 	default "stm32c071xx" if SOC_STM32C071XX
+	default "stm32c091xx" if SOC_STM32C091XX
+	default "stm32c092xx" if SOC_STM32C092XX